\documentclass{article}
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\begin{document}
\begin{equation*}
{ 2 } = \frac{ 2 + 2 }{2} 
= \frac{ \frac{ 2 + 2 }{2}  + \frac{ 2 + 2 }{2}  }{\frac{ 2 + 2 }{2} } 
=


\end{equation*}
\end{document}
